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Finding the Fourth Proportional to 389.78, 584.70 and 158.79

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Solution

The fourth proportional to 389.78, 584.70 and 158.79 is: 238.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.78 : 584.70 = 158.79 : x
  2. Step 2: Convert to fraction form
    389.78/584.70 = 158.79/x
  3. Step 3: Cross multiply
    389.78x = 584.70 × 158.79
  4. Step 4: Simplify right side
    389.78x = 92,844.51
  5. Step 5: Solve for x
    x = 92,844.51/389.78
  6. Step 6: Final answer
    x = 238.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.